Watch List notes:

BULGARIA: 20 Leva (1988) in silver (0,500) commemorating the Bulgarian Railways. National arms within circle, denomination and date bate below on obverse. Train engines, old and new, within circle on reverse. Inside slab by NGC "PF 67 ULTRA CAMEO / RAILWAYS ANNIVERSARY". Cert number: 6389132-098. (KM 171) & (Nikolov 217).